A glacier is an accumulation of ice, air, water, and rock debris orsediment. It is a large enough quantity of ice to flow with gravity due toits own mass. The ice can be as large as a continent, such as the icesheet covering Antarctica; or, it can fill a small valley between twomountains, such as a valley glacier. "Glacial landforms/processes"refers to the erosional or depositional processes of glaciers and thelandforms (e.g., drumlins, cirques, fjords) that result.